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> The range of problems I could tackle as a programmer was limited by math. It turns out this was partly true.

Would you mind expanding on this? I've often thought about going back to school for a math degree, or at least for the core degree courses.

Did functional programming, particularly in a pure language like Haskell, become easier to reason about once you had studied Category Theory in depth?

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There's no dependency between learning functional programming, including Haskell, and category theory. I say this as someone who is reading a CT book (Conceptual Mathematics) after being first exposed to the topic by learning Haskell.

You can actually go the other way around, from functional programming to mathematics: http://homepages.cwi.nl/~jve/HR/

I've seen that book a number of times before and always thought about reading it. Do you recommend it?

I think it's a great book and a great introduction to discrete mathematics, specifically the topics typically taught to CS undergrads.

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